CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES
Net income	$ 454	$ 528
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	197	210
Deferred income taxes	(10)	(2)
Provision for uncollectible accounts	13	7
Accrued interest on affiliate note	0	28
Changes in current assets and liabilities:
Accounts receivable	(42)	15
Accounts payable	6	(33)
Accrued income and other taxes	27	22
Other current assets and liabilities, net	(34)	(56)
Changes in other noncurrent assets and liabilities, net	(4)	(5)
Changes in affiliate obligations, net	(16)	(29)
Other, net	5	2
Net cash provided by operating activities	596	687
INVESTING ACTIVITIES
Capital expenditures	(196)	(144)
Changes in advances to affiliates	(402)	(482)
Proceeds from sale of property, plant and equipment and other assets	0	1
Net cash used in investing activities	(598)	(625)
FINANCING ACTIVITIES
Payments of long-term debt	(2)	0
Changes in advances from affiliates	0	(55)
Net cash used in financing activities	(2)	(55)
Net (decrease) increase in cash, cash equivalents and restricted cash	(4)	7
Cash, cash equivalents and restricted cash at beginning of period	10	4
Cash, cash equivalents and restricted cash at end of period	6	11
Supplemental cash flow information:
Income taxes paid, net	(161)	(178)
Interest paid, including affiliate interest (net of capitalized interest of $10 and $6)	(30)	(31)
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	4	9
Restricted cash - noncurrent	2	2
Total	$ 6	$ 11